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  • dnn-layer-mathbinary-test : add unit test for 'mul'

    11 avril 2020, par Guo, Yejun
    dnn-layer-mathbinary-test : add unit test for 'mul'

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    • [DH] tests/dnn/dnn-layer-mathbinary-test.c

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  • Issues when decoding video via ffmpeg with dxva2

    5 janvier 2016, par CD83

    I have successfully implemented a video player using ffmpeg. I am now trying to use hardware decoding but I’m facing a couple issues.
    I found a post that I followed as a starting point here : http://comments.gmane.org/gmane.comp.video.ffmpeg.libav.user/13523

    I have updated the code that setup the necessary stuff for the decoder. The updated code is available here : https://drive.google.com/file/d/0B5ufHdoDzA4ieVk5UVpxcDNzRHc/view?usp=sharing

    And this is how I’m using it to initialize the decoder :

    // Prepare the decoding context
    
AVCodec *codec = nullptr;
    
_codecContext = _avFormatContext->streams[_streamIndex]->codec;
    
if ((codec = avcodec_find_decoder(_codecContext->codec_id)) == 0)
    
{
    
    std::cout &lt;&lt; "Unsupported video codec!" &lt;&lt; std::endl;
    
    return false;
    
}
    

    
_codecContext->thread_count = 1;  // Multithreading is apparently not compatible with hardware decoding
    
InputStream *ist = new InputStream();
    
ist->hwaccel_id = HWACCEL_AUTO;
    
ist->hwaccel_device = "dxva2";
    
ist->dec = codec;
    
ist->dec_ctx = _codecContext;
    
_codecContext->coded_width = _width;
    
_codecContext->coded_height = _height;
    

    
_codecContext->opaque = ist;
    
dxva2_init(_codecContext);
    

    
_codecContext->get_buffer2 = ist->hwaccel_get_buffer;
    
_codecContext->get_format = GetHwFormat;
    
_codecContext->thread_safe_callbacks = 1;
    

    
if (avcodec_open2(_codecContext, codec, nullptr) &lt; 0)
    
{
    
    std::cout &lt;&lt; "Video codec open error" &lt;&lt; std::endl;
    
    return false;
    
}

    And here is the definition of GetHwFormat referenced above :

    AVPixelFormat GetHwFormat(AVCodecContext *s, const AVPixelFormat *pix_fmts)
    
{
    
    InputStream* ist = (InputStream*)s->opaque;
    
    ist->active_hwaccel_id = HWACCEL_DXVA2;
    
    ist->hwaccel_pix_fmt = AV_PIX_FMT_DXVA2_VLD;
    
    return ist->hwaccel_pix_fmt;
    
}

    When I open an mp4 (encoded in h264) video that is HD resolution or less, everything seems to be working fine. However, as soon as I try higher resolution videos like 3840x2160, I get the following errors repeatedly :

    Failed to execute: 0x80070057
    
Hardware accelerator failed to decode picture

    I also start getting the following errors after a few seconds :

    co located POCs unavailable

    And the video is not displayed properly : I get a lot of artifacts all over the video and it is lagging. I checked the first error in the ffmpeg source code. It seems that IDirectXVideoDecoder_Execute fails because of an invalid parameter. Since this is happening withing ffmpeg, there must be something that I’m missing but I can’t figure out what. The only relevant post that I found with this error was because of multithreading but I set the thread_count to 1 before opening the codec.

    This issue is happening on my main computer which has the following specs :

    • i7-4790 CPU @ 3.6GHz
    • RAM 16 GB
    • Intel HD Graphics 4600
    • Windows 8.1

    The same issue is not happening on my second computer which has the following specs :

    • i7 4510U @ 2GHz
    • RAM 8 GB
    • NVIDIA GeForce GTX 750Ti
    • Windows 10

    If I use DXVAChecker on my main computer, it says that my graphics card supports DXVA2 for H264_VLD_*, and I can see that the calls to the Microsoft API are being made (DXVA2_DecodeDeviceCreated, DXVA2_DecodeDeviceBeginFrame, DXVA2_DecodeDeviceGetBuffer, DXVA2_DecodeDeviceExecute, DXVA2_DecodeDeviceEndFrame) while my video is playing.

    I also don’t see any increase of GPU usage (on either computer) between the version with hardware decoding and the version without ; however, I do see a decrease in CPU usage (not as much as I was expecting though). This is also very strange.

    Note that I tried both the Windows release available on the FFmpeg website, and a version that I compiled with —enable-dxva2. I have searched a lot already but I was unable to find what I’m doing wrong.

    Hopefully, someone can help me, or maybe point me to a better example ?

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